Valve-gear for explosive-engines.



i No. 741,848. PATENTED OCT. 20, 1903.

, G. W. STARR & J. H. GOGSWELL. VALVE GEAR FOR EXPLOSIVE' ENGINES.

APPLICATION FILED JULY 10, 1902. N0 MODEL. v x 2 SHEETS-SHEET 1.

witnesses NlTE STATES Patented October 20, 1903.

ATENT FFICE.

GEORGE W. STARR AND JOHN HENRY COGSIVELL, OF HAVANA, ILLINOIS.

VALVE-G EAR FOR EXPLOSlVE-ENGINES.

SPECIFICATION forming part of Letters Patent No. 741,848, dated October20, 1903.

Application filed July 10, 1902. Serial No. 115,055. (No model.)

To all whom it may concern:

Be it known that we, GEORGE STARR and JOHN HENRY CoeswELL, citizens ofthe United States, residing at Havana, in the county of Mason and Stateof Illinois, have invented certain new and useful Improvements inValve-Gear for Explosive-Engines; and we do declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

This invention relates to new and useful improvements ingasolene-engines, and especially to the provision of a three-point camrotating with a counter-shaft carrying a gearwheel driven from the mainpower-shaft and provided for the purpose of actuating exhaustmeans,'while the gear wheel is utilized for the purpose of driving awalking-beam designed to drive a pump or other mechanism.

Another feature of the invention resides in the provision of a notchedwheel rotating with and adjacent to the three-point camwheel, which isadapted at each revolution of accompanying drawings, which, with theletters of reference marked thereon, form a part of this application,and in which drawings similar letters of reference indicate like partsin the views, in which- Figure l is a side elevation of an engine,showing our improved means for actuating the exhaust mechanism and foroperating the sparker. Fig. 2 is a View, on an enlarged scale, of thethree-point cam and oscillating lever actuated thereby. Fig. 3 is a viewin side elevation showing the notched wheel and means for actuating thesparker mechanism. Fig. 4 is an enlarged detail view of the notchedwheel and rod actuated thereby. Figs. 5 and 6 are detail views of partsof the mechanism.

Reference now being had to the details of the drawings by letter, Adesignates the frame of our engine, having a main powershaft B suitablyjournaled in the chamber 0, and keyed to said shaft are the fly-wheelsD. At one end of the combustion-chamber is a spring-actuatedexhaust-valve E, controlling the exhaust-port in the combustion-chamber,and pivotally mounted to rock on a shaft F, carried by the frame of theengine, is a lever G, having a tapering lug or projection G on its upperedge, near one end thereof, while its other end is positioned adjacentto and direotly under the lower end of the shank portion of theexhaust-valve, as shown. Keyed to rotate with the shaft N is a camwheelH, having three points (designated by letters K) which are positionedequidistant about the circumference thereof, and keyed to the other endof said shaft N is a gear-wheel M, the circumferential teeth of whichare in mesh with the teeth of the pinion O, keyed to rotate with themain power-shaft. To said gearwheel is adjustably and pivotally held oneend of a pitman-rod R, the other end of which is pivotally fastened toone end of the walking-beam P, which oscillates on a pin P, carried bythe post S. The opposite end of said walking-beam is designed to beconnected to the piston of a pump or to other mechanism, as'may bedesired.

Keyed to the shaft N is a wheel Q, having three notches Q formed atlocations equidistant about its circumference, and to protect each ofthe edges of the notches steel faceplates T are screwed or otherwisesecurely fastened to the edges of the notches to prevent rapid wearthereon. A rod J, which passes through an apertured arm W, mounted on arock-shaft W of a sparking apparatus, carries a spring W one end ofwhich bears against a nut W. Said shaft W carries an electrode Wdesigned to contact with a second electrode W, on which said rod isreciprocated. In one end of said rod J is a notch J, in which the outerfree ends of the plates '1 engage as the wheel Q, rotates, thus causingthe sparking mechanism to be actuated three times by said wheel Q and atsuch predetermined moments as to cause the charge.

of gas to be exploded within the combustionchamber.

Referring to Figs. 2, 5, and 6 of the drawings, it will be observed thatsaid rod J passes through an aperture in the upper end of the arm W,which is adjustably held by means of a bolt passing through the rockinglever G and held by means of suitable nuts. A springactuated dog V isadapted to be held by means of a spring V, seated in aslot in said armW, yieldingly against the rod.

From the foregoing it will be noted that by the use of a three-point camWe are enabled to force the exhaust-valve directlyfrom the cam-wheel andutilize the gear-wheel solely for the purpose of driving the pitman,which latter in turn actuates the walking-beam, to which the pump-pistonmay be connected, and by the provision of a notched Wheel having a platein each notch corresponding to the points of the cam the sparkingmechanism is actuated at the proper moments.

Having thus described our invention, What we claim to be new, and desireto secure by Letters Patent, is-

1. In combination with the power-shaft, a pinion-Wheel thereon, acounter-shaft, a gear- Wheel mounted thereon and in mesh with saidpinion, a three-point cam'rotating with the power-shaft, a valve, arock-lever with a lug thereon designed to be tripped by the points ofthe cam to actuate said valve, a notched wheel keyed to rotate with thecounter-shaft, a sparker and a spring-actuated notched rod for operatingthe same, a plate carried by said lever and through which plate said rodpasses, and a spring-pressed dog bearing against said rod to hold samein contact with the notched Wheel, as set forth.

2. In combination with the power-shaft, a pinion-wheel thereon, acounter-shaft, agearwheel mounted thereon and in mesh with said pinion,a three-point cam rotating with said poWer-shaft,a valve, a rock-leverwith a lug thereon designed to be tripped by the points of said cam toactuate said valve, a notched wheel keyed to rotate with thecounter-shaft, a sparker and a spring-actuated notched rod for operatingthe same, a bolt passing through said lever, a plate mounted on saidbolt, a spring-pressed dog carried by said plate and adapted to bearagainst and hold said rod in contact with the notched wheel, as setforth.

In testimony whereof We hereunto affix our signatures in presence of twowitnesses.

GEORGE W. STARR, JOHN HENRY COGSWELL. Witnesses:

J. B. FAGER, W. A. HEMING, Sr.

